61221013 has 8 divisors (see below), whose sum is σ = 70621632. Its totient is φ = 51984096.

The previous prime is 61221011. The next prime is 61221047. The reversal of 61221013 is 31012216.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61221013 - 2¹ = 61221011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61221011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40120 + ... + 41617.

It is an arithmetic number, because the mean of its divisors is an integer number (8827704).

Almost surely, 2^61221013 is an apocalyptic number.

It is an amenable number.

61221013 is a deficient number, since it is larger than the sum of its proper divisors (9400619).

61221013 is a wasteful number, since it uses less digits than its factorization.

61221013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81851.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 61221013 is about 7824.3857905908. The cubic root of 61221013 is about 394.1245644434.

Adding to 61221013 its reverse (31012216), we get a palindrome (92233229).

The spelling of 61221013 in words is "sixty-one million, two hundred twenty-one thousand, thirteen".